/***************************************************************************
 *   Copyright (C) 2009-2010 by Clockwise   *
 *   copyright@clockwise.ee   *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/

#import "ExtendedNSString.h"


static NSCharacterSet *hexdecimalCharacters;

@implementation NSString(Extended)

- (BOOL)holdsIntegerValue
{
    if ([self length] == 0) {
        return NO;
	}
    
    NSCharacterSet *validCharacters = [NSCharacterSet decimalDigitCharacterSet];
	
	int i;
    for (i=0; i<[self length]; i++) {
        unichar oneChar = [self characterAtIndex:i];
        if (![validCharacters characterIsMember:oneChar]) {
            return NO;
		}
    }
	
    return YES;
}

- (BOOL)holdsHexadecimalValue
{
	NSString *compare = [self lowercaseString];
	
	if (!hexdecimalCharacters) {
		hexdecimalCharacters = [NSCharacterSet characterSetWithCharactersInString: @"0123456789abcdef"];
	}
	
	int i;
    for (i=0; i<[self length]; i++) {
        unichar oneChar = [compare characterAtIndex:i];
        if (![hexdecimalCharacters characterIsMember:oneChar]) {
            return NO;
		}
    }
	
	return YES;
}

- (NSString *)trim
{
	return [self stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
}

@end
